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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6b69a816c0c50ec4347988690f65317b84852b4edbfc9b6f08ebcc0f0a2819' 
  AND token = 'RKgYfnE5ombo06UVwgjOEDptdB+ciQ08IikbFo8mtUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}